Semi-automatic sewing machine for operating on garment belts having belt-loops

ABSTRACT

A semi-automatic sewing machine for operating on garment belts having belt-loops for example skirts or trousers in which a belt guide and a belt-loop forming means are mounted in front of the needles of a double-needle sewing head on a movable plate with the plate being movable towards the needles in synchronism with the movement of a feed dog of the sewing machine. The belt-loop forming means consists of two jaws spaced somewhat apart and being pivotable in two mutually perpendicular planes.

[1 1 3,726,242 1451 Apr. 10,1973

2,730,976 1/1956 Loclen 12/121.27 X

m T MN G W G SN CO I G mm mm R E AP mm mm m FOREIGN PATENTS OR APPLICATIONS BELTS HAVING BELT-LOOPS 1 lnventorsl Ilia Jurievich Eskin, Polosk; Ilia 1,073,396 3 1954 France............................112 121.27 Samuilovich Zak, Moscow; Sergei 613,447 6/1960 Italy................................112/12127 Vasilievich Kuznetsov, Vladimir Moscow; Khlebalin,

Sergeevich Primary Examiner-James R. Boler Attorney-J-lolman & Stern Moscow; Mikhail Srulevich Lozovsky, Moscow, all of USSR.

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towards the needles in synchronism with the movement of a feed dog of the sewing machine. The belt-loop forming means consists plate being movable [52] US. Cl. ..............ll2/12L27, 112/147, 112/104 [51] Int. 23/00 [58] Field of Search..;..................112/12l.27, 2, 147,

of two jaws spaced somewhat apart and being pivotable in two mutually perpendicular planes.

References Cited UNITED STATES PATENTS 7 Claims, 5 Drawing Figures 2,700,946 Stanley et a], 12 147 x PATENTUJ APR 1 0 975 SHEET 3 BF 5 PATENHDAPR 1 DIST?) 3 726,242 SHEET U [1F 5 PATENTED APR 1 0197s SHEET 5 BF 5 SEMI-AUTOMATIC SEWING MACHINE FOR OPERATING ON GARMENT BELTS HAVING BELT-LOOPS BACKGROUND OF THE INVENTION The present invention relates to a semi-automatic sewing machine for operating on garment belts having belt-loops, such as trousers or skirts.

Prior Art A semi-automatic sewing apparatus for operating on trouser belts is known in which a belt guide and a beltloop forming means are mounted on the bed in front of the needles of a double-needle sewing head and drawing rollers are mounted behind the needles. (US. Pat. No. 2700946, Class 112-2). In the known semi-automatic apparatus, a belt-loop is attached at both ends in a simultaneous operation to the belt and sewing of the latter to the garment.

However, the belt guide and the belt-loop forming means being mounted on a stationary block complicate the feeding of a belt-loop into the stitching area and hamper the approach to the stitching mechanisms. In addition, feeding of a belt-loop under the presser-foot of a double-needle sewing head from above fails to provide for an accurate attachment of the belt-loop at a given spot, since the presser foot displaces the belt-loop with respect to the belt.

Moreover the belt-loops are fed into the guide manually and the work requires the utmost attention of the operator. Other wise, the belt-loop might be warped with respect to the belt or the edges thereof might be irregularly folded and missed by the stitching.

Objects and Summary of the Invention An object of this invention is to eliminate the abovementioned disadvantages.

Another object of the invention is to provide an automatic sewing machine for operating on garment belts having belt-loops in which a formed belt-loop is fed as close as possible under the stitching instrumentalities in synchronism with the feeding of other workpieces of a belt.

According to the present invention the above objects are achieved by the provision of a semi-automatic sewing machine for operating on garment belts having beltloops in which a belt guide and a means for forming and feeding a belt-loop to the sewing mechanism are mounted on the bed of a double-needle sewing head in front of the needles, while drawing rollers are mounted behind the needles, with the belt guide and belt-loop forming means being mounted on a movable plate which is shifted towards the needles in synchronism with the movements of the feed dog of the sewing head, and in which the means for forming belt-loops include two spaced apart jaws pivotable in two mutually-perpendicular directions.

Such an accomplishment of the above objects enables the belt-loop forming means to be moved away from the area of the attachment of the belt-loops to a belt and provides for a free approach to the sewing instrumentalities of the sewing head.

Feeding of a belt-loop in an exactly fixed direction allows the accurate positioning of the belt-loop on a belt, and the synchronous feed of the belt guide and the feed dog enables the displacement of a belt-loop during the attachment of the latter to be eliminated.

The fact that the forming jaws are pivotable in two mutually perpendicular directions ensures the forming of a high quality belt-loop, as well as its firm grip until the moment of attachment.

It is expedient that the bed of a double-needle sewing machine have a slot provided with guides for the mova ble plate to travel therealong.

it is desirable that the movement of the plate synchronously with the movement of the feed dog be carried out with the help of a gear engaged with a gear clutch mounted on a longitudinally movable pivot pin, and a toothed rack fixed on the bottom surface of the movable plate and adapted to interact with the gear, while the stopping of the movable plate is effected by a fork fixed on the bottom surface of the movable plate with the fork being adapted to coact with the gear clutch.

It is expedient that the movable plate have a slot with a pivot pin therein, with the belt guide being pivotably mounted on the pin, and the turning of the guide being effected due to the coaction of rollers mounted on the guide with cams located in the bed slot while the plate 15 moving.

It is desirable that pivoted bushings be arranged in the movable plate slot to which bushings the jaws are fixed with pivot screws, and the turning action of the jaws in two mutually perpendicular directions during the movement of the plate being effected by the coaction of the earns a few of which are fixed on the jaws and others located in the bed slat.

It is expedient that the return of the movable plate to the initial position be effected by the interaction of the roller fixed on the bottom surface of the movable plate and a slide block shiftable in the guides on the bed with, a belt-loop feeding means being mounted on the slid block.

It is also expedient that the belt-loop feeding means have a tubular guide consisting of two spring-loaded blades mounted at an angle to each other.

Such a construction of the means for feeding beltloops to the forming area allows the feeding of a beltloop only in one direction and provides for feeding belt-loops one by one, as well as from a supply roll, thus preserving an accurate orientation of a belt-loop respective to a belt.

The invention will now be described further and explained in an embodiment thereof by way of example with reference to the accompanying drawings, wherein:

Brief Description of the Drawing FIG. 1 is a general view of a semi-automatic sewing machine for operating on garment belts having beltloops, according to the invention.

FIG. 2 is a fragmentary view in perspective of the belt guide drive in the semi-automatic sewing machine of the invention.

FIG. 3 is an exploded view in perspective of a beltguide means and a belt-loop forming device in the semi-automatic sewing machine of the invention.

FIG. 4 is an exploded view in perspective of a beltloop feeding means and a knife mechanism in the semiautomatic sewing machine of the invention and FIG. is a fragmentary view in perspective illustrating the operating technique for garment belts having belt-loops.

Detailed Description of the Drawings A semi-automatic sewing machine for operating on garment belts having belt-loops, say, trousers, comprises a double-needle sewing head 1 (FIG. 1), a bed 2 on which in front of needles 3 are mounted a belt guide 4, a belt-loop forming means 5 (FIG. 3), and a means 6 (FIG. 1) for feeding belt-loops to the forming area.

Drawing rollers 7 which effect the feeding of an article in synchronism with the feed dog mechanism (not shown in FIG. 3) are mounted behind the needles 3 of the sewing head 1.

A reel 8 with the belt lining strip wound thereon is mounted on the arm of the double-needle sewing machine 1, with the lining strip passing through a guide 9 before being directed to the seaming area.

The guide 4 and the belt-loop forming means 5 ar mounted on a movable plate 10 which is traversable along guides 11 (FIG. 2) ofa groove 12 in the bed 2.

The movable plate 10 (FIG. 3) is shifted towards the needles 3 in synchronism with the movement of the feed dog of a cloth feeding mechanism with the aid of a rack 13 and a gear 14 (FIG. 2) interconnected with a gear clutch consisting of two part clutch member 15 and 16.

The rack 13 (FIG. 3) is fixed with screws 17 on the bottom surface of the movable plate 10 and has a fork 18 whose legs are provided with bevels 19. The legs of the fork 18 enter a circular groove of the clutch member 16 (FIG. 2) and allow the gear clutch to release when the guide 4 reaches the preset (rearmost) position in the seaming area.

The gear 14 is engaged through the semi-clutch 15 with the clutch member 16 which is fixed on a pivot pin 20 mounted in the arms of the bed 2 for pivotal movement. The members 15 and 16 are locked with a spring 21 whose tension is adjustable by a ring 22. The ring 22 is screw-mounted at the end of a bushing which constitutes part of a free-wheeling clutch 23. The clutch member 16 is mounted on the bushing with the aid of feather keys (not shown in the drawing). Such a mounting makes it possible to transfer torque during the axial movement of the clutch member 16.

A bushing 24 having a circular groove 25 is fastened on the pivot pin 20 and one of the arms of a double-arm lever 26 is located in the groove. The lever 26 is mounted on a pivot screw. The second arm of the lever 26 carries a roller 27. The roller 27 of the lever 26 being pressed, the bushing 24 is displaced and the pivot pin 20 is pulled thereafter and the latter can disengage the gear 14 from the member 16. Thus, the transmission of movement of the rotating main shaft of the sewing machine 1 to the plate 10 can be avoided. This condition is necessary to stop the guide 4 in front of the needles 3 of the sewing head 1, and also to remove the guide 4 from the seaming area. When the clutch member 15 and 16 are locked, the plate 10 with the guide 4 is moved into the seaming area.

The gear 14 receives intermittent rotary movement through the free-wheeling clutch 23 from a shaft 28 of the cloth feeding mechanism. The movement is transmitted by way of a link 28a mounted on the shaft 28 and a connecting link 29 interconnected with one of the rings of the free-wheeling clutch 23.

The movable plate 10 (FIG. 3) has a slot 30 with a pivot 31 disposed therein. The belt guide 4 is mounted on the pivot 31 which is arranged in eyes 32 of the plate 10. Thus making it possible for the guide 4 to turn around the pivot 31.

The turning action of the guide 4 is effected by the interaction of rollers 33 mounted on the guide 4 and a cam 34 (FIG. 2) located in the groove 12 of the bed 2. The turning of the guide 4 is necessary to effect pressing of a belt-loop before its forming.

The belt-loop forming means 5 (FIG. 3) comprises two spaced apart jaws 35 pivotable in two mutually perpendicular directions the jaws have the form of oblong arms with the ends thereof being provided with chamfers 36 for folding the belt-loop ends.

The jaws 35 are fixed with screws 37 on pivoted bushings 38 mounted on a pin 39. The latter is located in the slot 30 of the movable plate 10.

The fact that the jaws 35 are mounted on the bushings 38, the screws 37 provide for the movement of the jaws in two planes, i.e., vertical due to the turning action of the bushings 38 about the pin 39 and horizontal due to the turning action of the jaws 35 on the screws 37.

The jaws 35 are drawn together by a spring 40 which provides for the extension of the opposite ends for folding the ends of belt-loops.

The turning action of the jaws in two mutually perpendicular planes is effected by the interaction of earns 41 and 42 during the movement of the plate 10, with the cams 41 being fixed from below on the jaws 35, and the cam 42 being located in the groove 12 of the bed 2.

When the plate 10 is moving the jaws 32 are first somewhat lifted above the surface of a plate 43 of the guide 4 and then approach each other. Such a complicated movement of the jaws 35 in combination with the turning action of the guide 4 provides for a reliable folding of belt-loop ends before the attachment of the latter to the belt.

The return of the jaws 35 and the guide 4 to the initial position is effected, while the guide 4 is withdrawn from the working area, by the action of springs 40 and 44. The blade spring 44 is fixed on a bridge in the slot 30 of the plate 10. The plate 10 and the guide 4 are withdrawn from the seaming area with the help of a slide block 45 having a toothed rack 46 on the side surface thereof (FIG. 4). The rack 46 engages a gear 47 mounted on the output shaft of an electric drive 48.

The slide block 45 is moved in guide rollers 49 limiting sideward shifting thereof.

The plate 10 carries a roller 50, (FIG. 3). When the slide block 45 is moving, a chamfer 51 thereof presses the roller and causes the withdrawal of the plate 10 with the guide 4 from the seaming area. The slide block 45 simultaneously presses the roller 27 (FIG. 2) of the double arm lever 26 and the latter disengages the clutch members 15 and 16 through the pivot 20. Since the gear 14 is freely mounted on the pin 20 the latter does not any longer limit the movement of the guide 4 from the seaming area. The range of shifting of the slide block 45 is limited by microswitches 52 and 53 (FIG. 4), connected to the control circuit of the electric drive 48. This circuit is a simple and widely known one and is thus not a subject of a more detailed consideration herein.

A guide 54 (FIG. 1) is fixed on the plate ,10 with the help of screws, with the guide carrying hook-like guides and spring-loaded clamps for a trouser belt. The trouser belt is handled from a reel 55 mounted under the sewing machine bed 2.

The slide block 45 is connected to the means 6 for feeding belt-loops into the forming area, the means having a tubular guide consisting of two resilient blades 56 and 57 (FIG. 4) between which a belt loop is held while being fed into the forming area. The means 6 is mounted on a plank 58 which is placed in a groove of the bed 2.

Rests 59 and 60 carrying a plate 61 are mounted on the plank 58. The plate 61 has a recurved edge with a slot 62. Belt-loops unwound from the supply reel are fed through the slot 62 (FIG. 1). A belt-loop having passed through the slot 62 enters the means 6 and the end thereofis gripped by the blades 56 and 57 (FIG. 4).

The means 6 is shifted in the groove with the help of a plank 64. The plank 64 is locked in with the slide block 45 so as to move therewith. The plank 64 interacts with the rests 59 and 60 to make the plank 58 move together with the elements fixed thereon. The rests 59 and 60 are arranged in such a manner as to ensure an idle stroke for the plank.64. Sucha construction is necessary to actuate the belt-loop feeding means only after the guide 4 has been withdrawn from the seaming area.

As mentioned above, the guide 4 is withdrawn from the seaming area due to theinteraction of the chamfer 51 of the slide block 45 with the roller 50 (FIG. 3) mounted on the movable plate 10. With the guide 4 withdrawn, the slide block 45 keeps moving which results in the plate 61 (FIG. 4) approaching the rest 60 and, through engagement therewith, shifts the means 6.

d The means 6 with the blades 56 and 57 leads a beltloop below the uplifted plate 43 (FIG. 3) of the guide 4. The end of a belt-loop is gripped by a spring 65 (FIG. 2) and held between the spring and the left jaw 35 (FIG. 3). The jaw 35 has a notch to ensure a more reliable clamping of the belt-loop.

After a belt-loop has been clamped with the spring 65, the means 6 with the blades 56 and 57 is withdrawn from the seaming area. The blades 56 and 57 let the belt-loop pass freely therebetween. The withdrawal of the means 6 from the seaming area is effected with the help of the slide blok 45.

A belt-loop is fed to the forming area from a roll (one by one feeding is possible). A belt-loop of a given length should be cut as it is fed from a supply roll. For this purpose, a knife mechanism is mounted on the machine bed in a housing 66 (FIG. 4). A stationary knife 67 is arranged in a slot 68 of the housing 66 and is held with a spring 69 fastened with a screw to the housing 66.

A movable knife 70 is fixed on a block 71 consisting of two parts. The block enters a slot 68a in the housing 66. The knife 70 is actuated by a lever 72. The lever 72 is mounted on a screw 73 turned into the housing 66. A blade spring 74 fastened with a screw 75 presses the block 71 and returns the knife 70 into the initial position after a working stroke has been completed.

, detent 84 and holds the latter and hence the spring 65.

The lever 72 enters a fork in the block 71. The lever 72, with the help of a rod 76 and through a triplearm lever 77 (FIG. 1) and a rod 78 is connected to the armature of an electromagnet 79. The moment the microswitch 52 is closed, and electromagnet 79 is energized, the armature is drawn in and the knife mechanism is brought into action.

The lever 77 is mounted on a screw 80.

A pin 81 is pressed into the shorter arm of the lever 77 (FIG. 2). and enters the slot of a bell-crank lever 82, with the lever 82 being mounted on a screw 83.

The bell-crank lever 82 interacts with a detent 84 which is pivotable, as if on an axle, on a screw 85. The screw 85 is passed through a plate 86, and the plate 86 is mounted on the sewing machine bed 2 with the beltloop clamping mechanism mounted thereon. The mechanism is actuated from the lever 82 which is connected to the electromagnet While turning, the detent 84 causes a slide block 87 to move along the slot of the plate 86. A cam 88 is attached to the slide block 87. The cam 88 during the movement thereof engages the recurved edge of the spring with the spring 65 serving to hold a belt-loop end in the forming area. The cam 88 lifts the spring and clears the passage for the introduction of a belt-loop; the spring'65 is released thereafter to ensure pressing of the belt-loop against the jaw 35.

A spring 89 is fixed on the plate 86 and engages the (through the slide block 87 and the cam 88) in the open position.

After a belt-loop has been fed into the forming area, the slide block 45, with the sharp edge of the chamfer 51 releases the spring 89, and the spring releases the detent which causes the spring 65 to lower, with the end of the blet-loop being gripped.

The detent 84 is spring-loaded in order to provide for a more reliable work of the belt-loop gripping mechanism.

On the plate 86 is mounted a guide 90 (FIG. 1) whose collar 91 provides a rest along which the article being operated, say, trousers is fed into the seaming area.

The semi-automatic sewing machine operates in the following manner:

An article A being operated upon is removed from a stack and is manually placed on the guide 90 in such a way that the edge of the article should slide along the collar 91 while being fed into the stitching area.

Belt lining strip (B) is fed from the supply reel 8 by virtue of the guide 9, wherein it is being formed and fed further into the seaming area. The trouser belt C is fed to the working area from the reel 55 through the guides and clamps of the plate 54 and through the guide 4. The belt-loop D from the reel 63 is fed to the means 6 and is clamped therein between the resilient blades 56 and 57. At the starting point, the spring 65 (FIG. 2) of the belt-loop clamping mechanism is raised and the detent 84 is placed behind the spring with the guide 4 being the seaming area.

The belt is stitched to the article up to the spot where a belt-loop is to be attached. On approaching the given spot, the sewing machine is stopped (this is controlled by the operator). The automatic belt-loop feeding system is energized by the operator, whereupon the electric drive 48 starts rotating the gear 47. The gear 47 causes the slide block 45 to move and the slide block withdraws the guide 4 from the needles by way of the interaction of the roller 50 with the chamfer 51, and the belt-loop is fed by the blades 56, 57 into the forming area. The end of a belt-loop is gripped by the spring 65 when the detent 84 is released by the sharp edge of the slide block chamfer 51. While returning the slide block 45 brings the belt-loop feeding means 6 to the initial position, simultaneously the magnet 78 is energized to bring into action the knife 70, and a belt-loop is cut from the supply roll.

The friction clutch control pedal is depressed by the operator and the sewing is continued.

The guide 4 mounted on the plate 10 is moved thereon together with the belt by the feed dog of the sewing machine 1 to the seaming area.

When plate 10 is moved (FIG. 3) the guide 4 is turned around the pivot 31 (FIG. 3) due to the interaction of the rollers 33 with the cam 34 (FIG. 2). The plate 43 of the guide 4 is lowered on the belt-loop pressing it with its projecting ends so that the belt-loop ends are uplifted. During further movement of the plate 10, the earns 41 interact with the earns 42 forcing the jaws 35 to rise and shift so that the chamfers 36 thereof grip the uplifted ends of belt-loops and fold them on the plate 43. The belt-loops are held in such a position until being pricked by the needles 3. The guide 4 is stopped after the belt-loop has been pricked by the needles 3.

Meanwhile the legs of the fork 18 (FIG. 2) enter the circular groove of the clutch member 16 and draw it aside, i.e., disengage the gear clutch, as a result of which the plate 10 with the guide 4 and the belt-loop forming means 5 mounted thereon, is stopped.

The operator depresses the friction clutch control pedal again, and the belt-loop clamped between the belt and the belt lining strip leaves the jaws 35 and is finally stitched to the belt. The operator continues sewing until the spot where the next belt-loop is to be attached, whereupon the belt-loop feeding and attaching cycle is repeated.

Thus, the semi-automatic sewing machine disclosed herein provides for feeding the belt-loop D (FIG. 5) into the forming area, cutting the belt-loop from a supply roll, folding the ends thereof and attaching the belt-loop on the belt C with the simultaneous joining of the belt C and the belt lining strip B to the article A.

The semi-automatic sewing machine allows substantially increased labor productivity, improved quality and the elimination ofa plurality of manual operations.

We claim:

1. A semi-automatic sewing machine for operating on garment belts having belt-loops and a belt-lining strip, comprising: a sewing head having double needles: a bed with said sewing head mounted thereon: a feed dog for transporting a garment to which the belts are to be attached, means mounting said feed dog under the needles: a belt guide for forming a belt, means mounting said guide in front of the needles; a belt-loop forming means mounted in front of the needles; a belt-loop feeding means mounted normal to the direction of movement of the belt and belt-lining strip; drawing rollers for transporting a garment, means mounting said rollers behind the needles; a movable plate mounted in said bed, said movable plate carrying said belt guide and said belt-loop forming means and being movable towards the need es synchronously with the movement of said feed dog; said belt-loop forming means comprising two jaws spaced somewhat apart and pivotable in two mutually perpendicular directions, and said jaws serving for folding the belt-loop end and clamping the ends in such position until the belt-loops are pricked by the needles.

2. The semi-automatic sewing machine according to claim 1, wherein the bed has a groove provided with guides for shifting a movable plate therealong.

3. The semi-automatic sewing machine according to claim 1, wherein the synchronous movement of the plate and the feed dog is effected by a gear, a gear clutch engaged by the gear, a longitudinally movable pivot on which the gear clutch is mounted and a rack fastened from below on the movable plate, said rack being engageable with said gear and a fork fastened from below on said movable plate engagable with the gear clutch for stopping the movable plate.

4. The semi-automatic sewing machine according to claim 1, including a roller fastened from below on the movable plate, a slide block movable in the bed guides, and means connecting said slide block to the belt-loop feeding means for effecting the return of the movable plate to an initial position.

5. The semi-automatic sewing machine according to claim 4, wherein the belt-loop feeding means is provided with a tubular guide consisting of two spring blades mounted at an angle to each other.

6. The semi-automatic sewing machine according to claim 2, wherein the movable plate has a slot, a pivot pin being located in the slot, the belt guide being pivotally mounted on said pin, rollers mounted on the guide, and a cam located in the bed groove, the turning of the belt guide around the pin being due to the interaction of the rollers and the cam, with said interaction occurring while said plate is being moved.

7. The semi-automatic sewing machine according to claim 6, including pivotable bushings arranged in the slot of the movable plate, said bushings having jaws attached thereto via screws, the bushings being turnable in two mutually perpendicular directions through the interaction of cams, at least some of the cams being mounted on the jaws and others being located in the bed groove, with said interaction occurring while said plate is being moved. 

1. A semi-automatic sewing machine for operating on garment belts having belt-loops and a belt-lining strip, comprising: a sewing head having double needles: a bed with said sewing head mounted thereon: a feed dog for transporting a garment to which the belts are to be attached, means mounting said feed dog under the needles: a belt guide for forming a belt, means mounting said guide in front of the needles; a belt-loop forming means mounted in front of the needles; a belt-loop feeding means mounted normal to the direction of movement of the belt and belt-lining strip; drawing rollers for transporting a garment, means mounting said rollers behind the needles; a movable plate mounted in said bed, said movable plate carrying said belt guide and said belt-loop forming means and being movable towards the needles synchronously with the movement of said feed dog; said belt-loop forming means comprising two jaws spaced somewhat apart and pivotable in two mutually perpendicular directions, and said jaws serving for folding the belt-loop end and clamping the ends in such position until the belt-loops are pricked by the needles.
 2. The semi-automatic sewing machine according to claim 1, wherein the bed has a groove provided with guides for shifting a movable plate therealong.
 3. The semi-automatic sewing machine according to claim 1, wherein the synchronous movement of the plate and the feed dog is effected by a gear, a gear clutch engaged by the gear, a longitudinally movable pivot on which the gear clutch is mounted and a rack fastened from below on the movable plate, said rack being engageable with said gear and a fork fastened from below on said movable plate engagable with the gear clutch for stopping the movable plate.
 4. The semi-automatic sewing machine according to claim 1, including a roller fastened from below on the movable plate, a slide block movable in the bed guides, and means connecting said slide block to the belt-loop feeding means for effecting the return of the movable plate to an initial position.
 5. The semi-automatic sewing machine according to claim 4, wherein the belt-loop feeding means is provided with a tubular guide consisting of two spring blades mounted at an angle to each other.
 6. The semi-automatic sewing machine according to claim 2, wherein the movable plate has a slot, a pivot pin being located in the slot, the belt guide being pivotally mounted on said pin, rollers mounted on the guide, and a cam located in the bed groove, the turning of the belt guide around the pin being due to the interaction of the rollers and the cam, with said interaction occurring while said plate is being moved.
 7. The semi-automatic sewing machine according to claim 6, including pivotable bushings arranged in the slot of the movable plate, said bushings having jaws attached thereto via screws, the bushings being turnable in two mutually perpendicular directions through the interaction of cams, at least some of the cams being mounted on the jaws and others being located in the bed groove, with said interaction occurring while said plate is being moved. 